<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
        show-icon
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类级联选择框 -->
          <el-cascader
            :options="cateList"
            :props="cateProps"
            v-model="selectedKeys"
            @change="handleChange"
            ref="cateListRef"
            clearable
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- 分类参数 Tabs 页签 -->
      <!-- v-show="!isDisabled"== :style="{ display: cateId ? 'block' : 'none' }" -->
      <el-tabs
        @tab-click="handleTabClick"
        v-model="activeName"
        v-show="!isDisabled"
      >
        <!-- 动态参数页签 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            @click="addDialogVisible = true"
            type="primary"
            size="mini"
            :disabled="isDisabled"
          >
            添加参数
          </el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTabData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  :key="i"
                  v-for="(item, i) in scope.row.attr_vals"
                  closable
                  @close="handleClose(i, scope.row)"
                >
                  {{ item }}
                </el-tag>
                <!-- 文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- new tag 按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index"> </el-table-column>
            <el-table-column label="参数名称" prop="attr_name">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  @click="showEditditDialog(scope.row.attr_id)"
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                >
                  编辑
                </el-button>
                <el-button
                  @click="delParams(scope.row.attr_id)"
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                >
                  删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态属性页签 -->
        <el-tab-pane label="静态属性" name="only"
          ><el-button
            @click="addDialogVisible = true"
            type="primary"
            size="mini"
            :disabled="isDisabled"
          >
            添加属性
          </el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTabData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  :key="i"
                  v-for="(item, i) in scope.row.attr_vals"
                  closable
                  @close="handleClose(i, scope.row)"
                >
                  {{ item }}
                </el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index"> </el-table-column>
            <el-table-column label="属性名称" prop="attr_name">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  @click="showEditditDialog(scope.row.attr_id)"
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                >
                  编辑
                </el-button>
                <el-button
                  @click="delParams(scope.row.attr_id)"
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                >
                  删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="60%"
      @close="addCateDialogClosed"
    >
      <el-form
        :model="addForm"
        :rules="addFormRules"
        label-width="80px"
        ref="addFormRef"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="60%"
    >
      <el-form
        :model="editForm"
        :rules="addFormRules"
        label-width="80px"
        ref="editFormRef"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      cateList: [],
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        checkStrictly: true,
        expandTrigger: 'hover'
      },
      // 级联选择框 id
      selectedKeys: [],
      // 被激活的标签页名称
      activeName: 'many',
      // 动态参数数据
      manyTabData: [],
      // 静态属性数据
      onlyTabData: [],
      // 控制对话框的显示与隐藏
      addDialogVisible: false,
      editDialogVisible: false,
      // 添加 & 修改参数的表单验证规则
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 编辑参数的表单数据对象
      editForm: {
        attr_name: ''
      }
    }
  },
  // 页面刷新调用
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }
      this.cateList = res.data
    },
    // 级联选择框选中项变化，触发这个函数
    handleChange () {
      this.getParamsData()
    },
    // tab页签点击事件的处理函数
    handleTabClick () {
      this.getParamsData()
    },
    // 获取参数列表
    async getParamsData () {
      // 阻止用户选择一二级分类
      // 证明选中的不是三级分类
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        this.manyTabData = []
        this.onlyTabData = []
        return
      }
      // 证明选中的是三级分类
      // console.log(this.selectedKeys)
      this.$refs.cateListRef.dropDownVisible = false
      // 根据所选分类id，和当前所处面板，获取对应参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: {
            sel: this.activeName
          }
        }
      )
      // console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        item.inputVisible = false
        item.inputValue = ''
        // console.log(item.attr_vals)
      })
      // console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTabData = res.data
      } else {
        this.onlyTabData = res.data
      }
    },
    // 添加参数
    addParams () {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.getParamsData()
        this.addDialogVisible = false
      })
    },
    // 监听添加参数对话框关闭事件
    addCateDialogClosed () {
      this.addForm.attr_name = ''
    },
    // 编辑参数
    async showEditditDialog (id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${id}`,
        {
          attr_sel: this.activeName
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数失败！')
      }
      this.editForm = res.data
      // console.log(res.data)
      this.editDialogVisible = true
    },
    // 提交修改的参数
    async editParams () {
      // const { data: res } =
      await this.$http.put(
        `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
        {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        }
      )
      // console.log(res)
      this.getParamsData()
      this.editDialogVisible = false
    },
    // 删除参数
    async delParams (id) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch((err) => err)
      // 判断用户是否取消删除
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！')
      }
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${id}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 点击添加分类参数 切换按钮&文本框
    showInput (row) {
      row.inputVisible = true
      // $nextTick方法的作用 就是当页面上的元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(() => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 添加参数可选项
    handleInputConfirm (row) {
      if (row.inputValue.length === 0) {
        row.inputVisible = false
        row.inputValue = ''
        return
      }
      // console.log(row)
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    // 删除对应的参数可选项
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    },
    async saveAttrVals (row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(',')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数项成功！')
    }
  },
  computed: {
    // 判断是否禁用按钮
    isDisabled () {
      return this.selectedKeys.length !== 3
    },
    // 获取当前选中的三级分类的id
    cateId () {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2]
      }
      return null
    },
    // 添加动态对话框文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 5px;
}
.input-new-tag {
  width: 120px;
}
</style>
